Tool-holder.



G. KOHLHAAS.

TOOL HOLDER.

APPLICATION FILED JAN.3!.1914.

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TOOL HOLDER.

APPLICATION FILED JAN.31, I914- la lwfl Patented May 30, 1916.

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Q C George Jfaizlfiazcw,

GEORGE KOHLHAAS, OF ELMIRA, NEW YORK.

TOOL-HOLDER.

Specification of Letters Patent.

Patented May 3U, 1916.

Application filed January 31, 1914. Serial No. 815,786.

To all whom it may concern:

Be it known that I, Gnonen KoHLHAAs, a citizen of the United States,residing at Elmira, New York, have invented certain new and usefulImprovements in Tool-Holders, of which the following is a specification.

One object of my invention is to provide a tool which will be selfcompensating for irregularities or eccentricities in the work piece orin the driving spindle to which the tool is attached. It happens attimes that the stock or work piece will have such irregularities as tocause it to perform a move ment of an oscillatory character as itrevolves, and this may be true also of the spindle and it is to takecare of such conditions and to permit the dies to follow the stock thatmy invention has been devised in the main.

Other objects of my invention will hereinafter appear.

The invention consists in the features and combination and arrangementof parts hereinafter described and particularly pointed out in theclaims.

In the accompanying drawings :-Figure 1 is a sectional view through oneform of tool embodying my invention. Fig. 1" is a front view of the dieholder with two of the dies in place. Fig. 2 is a front view of theshank member. Fig. 3 a view of the rear face of the die holder. Fig. 4:is a view of the compensating piece. Fig. 5 is a front view of the dieholder with the dies in place. Fig. 6 is a rear view of one of the dies.Fig. 7 is a view of one of the die members looking from the inner sidethereof. Fig. 8 is a view of the die of Fig. 7, looking from the left ofFig. 7. Fig. 9 is a view similar to Fig. 1 of another form of diemembers and their mounting. Fig. 10 is a front view of Fig. 9. Fig. 11is a front view similar to Fig. 10 showing a button form of die. Fig. 12is a view of the invention for driving a tapping die.

In these drawings 1 is the shank of the tool to be connected with thedriving spin-. dle in any suitable manner. This shank has a head orflange 2 provided with a concave face formed substantially like asegment of a sphere. Two pins 3 project from this face, said pins havingend faces inclining radially outwardly and backwardly. In front of thisshank the die carrying piece 4 is placed, this having a threaded portion5, a flange 6 and a rear concaved face 7 which is also formed like asegment of a sphere or substantially so. Between these concave faces, ofthe shank and die carrier piece, a compensating member 8 is placed whichhas convex faces corresponding in curve or sphericity to the concavefaces mentioned. It has radially disposed openings or slots 9, 9 toreceive the pins 3 of the shank member and also to receive the pins 10projecting from the concave face of the die carrying piece. These pins10, like the pins 3, are formed with inclined end faces. These two pairsof pins 3 and 10 are disposed at right angles to each other, the pins 3engaging the slots 9 and the'pins 10 engaging the slots 9. The partsthus far described are held together by a hood 11 having a flange 12reaching over the flange 6 of the die carrier with a spring member 13interposed, this spring member being in the form of a conical metalring, the base of the cone being seated against the rear face of theflange 12.

The hood is secured in position by the screw 14. The dies 15 are held tothe die carrier by pins 16 passing through enlarged openings in the diesso that they may be adjusted. Nuts 17 hold the dies in adjustedposition; For adjusting the dies accurately I form their exterior facesconical as at 18, and employ a gage ring 19 screw threaded onto the diecarrier and having a conical interior to fit the conical surfaces of thedies. By loosening the nuts 17 the ring may be turned and set accordingto its graduations and in relation to the index mark 0 on one of thedies, and then by setting the dies out against the inner face of thegage ring and securing them in this position they can be set accuratelyto the proper gage. A space is left at a between the ring and hood toallow for the tipping or angular displacement of the die carrier inrelation to the axis of the tool.

It will be noticed that by reason of the pin and slot connection betweenthe spindle and die carrier and the compensating coupling piece, arelative lateral movement of the spindle shank and die carrier ispermitted and this displacement will not only be laterally but angularlyin respect to the axis of the spindle, and by the use of the yieldingmounting of the die carrier obtained by the use of the conical springthe die carrier can have an angular or tipping movement individually. j

It has been proposed heretofore to provide lateral (compensatingmovement of the die carrier in relation to the spindle, this 'movementbeing at right angles to the axes of these parts or in one planetransverse to the said axes. This will nottake care however, ofconditions due to irregularities which would make the work piece andspmcompensate for-lateral disalinement of the work piece and spindle andalso for angular disalinement, that is to say in the latter case wherethe axis of the work piece stands at an angle to the axis of the spindleinstead of beingjcoincident therewith or parallel'thereto, The sphericalor curved face compensating piece will allow the die to assume a'generalposition at an angle to the axis of the work piece or spindle or bothand the spring will allow the die 7 to straighten up into alinementaxially with the work piece, and thus the die will follow the workpieceor stock in its irregular movements should it have any.

Regarding the dies, these are provided with threads 20 which do thecutting and I below these the threads 21 areslabbed off at 22 to presentfaces inclining backwardly in relation to the direction of revolution toprevent cutting, so that these threads 21 will simply act as guidesfollowing in the threads formed by the cutting threads 20 and .thus theproper lead or movement of the stock 'anddie relative to each die willbe insured;

The. dies are formed inv sections and are individually removable so thatthey may be sharpened by grinding the face 24 or otherof the diecarrier.

wise treated for keeping them in proper working order, all their partsbeing accessible when they are removed from their holders; The dies ontheir rear faces are provided with key ways or grooves 25 fitted to thekeys or splines 26, seated in grooves These keys extend radially andguide the dies in their adjustment toward and from the center of thetool.

- Instead of mounting the dies on pins fixed to the die holding orcarrying piece 4, I may, as shown in Fig. 9, mount the dies on aplate 23by pins and nuts and guide them by radial grooves and keys in a mannersimilar to that described in connection withFig. 1. In this casehowever, the dies jjusting them I are not tapered on their outer sidesbut are of cylindrical form and for holding them to the piece 4, and fordriving and adprovide a ring 27 threaded ontothe piece 4 and having acylindrical interior to receive the dies and a flange 30 hold the diesagainst the up. The set or .their inner ends bear on the dies, and afterthe proper position of the dies has been attained the holding nuts areagain tightened gage screws are carried by the ring 27. This ring 27will also permit a button die to be used, such as shown in Fig. 11, andin this instance the point of 7 one of the set or gage screws reaches inthe tapered opening 32 of the button die to rotate the same.

In Fig. 12 I show the compensating connection or coupling arrangedbetween a spindle shank and a tapping die holder.

While I have described the invention in one embodiment thereof I do notlimit myself to the precise arrangement shown, except as specificallydefined in the appended claims.

I claim:

1. In combination with a tool spindle having a curved face, pinsprojecting from said face, a tool holder having an opposing curved rearface, pins thereon, and a spherically shaped coupling piece fitting inthe recess formed by said curved faces and having slots therein engagingwith the pins.

2. In combination with a tool spindlehaving a curved face, a tool holderhaving an opposing curved rear face, a spherically shaped coupling piecefitting in the space formed by said curved faces and a spring engagingdirectly with the holder so as to allow the holder to assume an angularposition in relation to the other parts.

8. In combination a spindle shank, a tool holder, a hood connected withthe shank and engaging the tool holder, a connection between the toolholder and spindle shank allowing the holder and shank to have relativelateral displacement and a spring interposed between the hood and holderto allow the holder to tip in relation to the hood, substantially asdescribed.

4. In combination a spindle shank, a tool holder, a connection betweenthe tool holder and shank allowing lateral displacement of one inrelation to theother, ing from the spindle shank having a flangeextending in front of a part of a holder and a spring interposed betweensaid flange and the holder to allow the latter to tip, substantially asdescribed.

5. In combination a spindle shank, a tool holder, a coupling piecebetween them having spherical like faces fitted to corresponding facesof the tool holder and spindle, said coupling piece being slotted, pinson the spindle and holder engaging the slots to allow lateral andangularmovement of the holder and spindle relative to each other, and ayielding mounting for the holder to allow it to tip individually inrelation'to the a hood extendaxis of the spindle, substantially asdescribed.

6. In combination a spindle shank, a tool holder, a coupling piecebetween them having spherical like faces fitted to corresponding facesof the tool holder and spindle, said coupling piece being slotted, pinson the spindle and holder engaging the slots to allow lateral andangular movement of the holder and spindle relative to each other,

and a yielding mounting for the holder to allow it to tip individuallyin relation to the axis of the spindle, said mounting including a hoodextending from the spindle inclosing the coupling piece and having aflange reaching in front of a part of a holder and a spring between saidflange and holder, substantially as described.

7 In combination a spindle, a tool holder and a spring mounting thereforcomprising a hood extending from the tool holder having a flange lyingin front of a part of the tool holder and a spring lying between saidflange and the tool holder, said spring being in the form of a conicalring, substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

GEO. KOHLHAAS.

Witnesses:

JOSEPH J. LUTZ, J. HUBERT BRAND.

Copiea of thlla patent may be obtained for five cents each, byaddressing the "Uoaloner of Patenta, Wmahington, D. C."

